Virtual Box is like VMWare, allows users to run other operating systems in a window or full screen.
It took me awhile to use the app successfully. I need to download the .ISO of operating system separately so that the Virtual Box can emulate it.
Windows 95:
Windows 3.11 (Mini version):
I feel happy for able to accomplish the software virtualization even only now despite having been a computer programmer and technician for more than a decade.